Spatio-temporal variability of strandings of the southern bull kelp Durvillaea antarctica (Fucales, Phaeophyceae) on beaches along the coast of Chile—linked to local storms

López, Boris A.; Macaya, Erasmo C.; Jeldres, Ricardo I.; Valdivia, Nelson; Bonta, César C.; Tala, Fadia; Thiel, Martín

doi:10.1007/s10811-018-1705-x

Cited by 18 publications

(8 citation statements)

References 90 publications

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“…Climate can affect wrack depositions. Factors such as winds and swell, and the interactions among these conditions and the tides, can detach macroalgae and macrophytes from their anchorages (Witman 1987, Seymour et al 1989, Krumhansl & Scheibling 2011, creating areas or times with predictable wrack depositions (Oldham et al 2010, López et al 2019, especially where there are consistent winds. For instance, increased seagrass deposits in the northwest Mediterranean are attributed to strong wind events (Jiménez et al 2017), higher than normal tides have increased wrack accumulation along Estonian shorelines (Suursaar et al 2014), and on the Pacific coastline of the USA, wave events caused by swell in creased wrack ac cu mu lations (Reimer 2014).…”

Section: Introductionmentioning

confidence: 99%

Sea wrack delivery and accumulation on islands: factors that mediate marine nutrient permeability

Wickham

Shackelford

Darimont

et al. 2020

Mar. Ecol. Prog. Ser.

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Sea wrack provides an important vector of marine-derived nutrients to many terrestrial environments. However, little is known about the processes that facilitate wrack transport, deposition, and accumulation on islands. Three broad factors can affect the stock of wrack along shorelines: the amount of potential donor habitat nearby, climatic events that dislodge seaweeds and transfer them ashore, and physical characteristics of shorelines that retain wrack at a site. To determine when, where, and how wrack accumulates on island shorelines, we surveyed 455 sites across 101 islands in coastal British Columbia, Canada. At each site, we recorded wrack biomass, species composition, and shoreline biogeographical characteristics. Additionally, over a period of 9 mo, we visited a smaller selection of sites (n = 3) every 2 mo to document temporal changes in wrack biomass and species composition. Dominant wrack species were Zostera marina, Fucus distichus, Macrocystis pyrifera, Nereocystis luetkeana, Pterygophora californica, and Phyllospadix spp. The amount of donor habitat positively affected the presence of accumulated biomass of sea wrack, whereas rocky substrates and shoreline slope negatively affected the presence of sea wrack biomass. Biomass was higher during winter months, and species diversity was higher during summer months. These results suggest that shorelines with specific characteristics have the capacity to accumulate wrack, thereby facilitating the transfer of marine-derived nutrients to the terrestrial environment.

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Section: Introductionmentioning

confidence: 99%

Sea wrack delivery and accumulation on islands: factors that mediate marine nutrient permeability

Wickham

Shackelford

Darimont

et al. 2020

Mar. Ecol. Prog. Ser.

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“…In coastal regions, many positively buoyant seaweeds are lost from the floating stock by stranding, which is mainly caused by tidal currents and onshore winds but also depends on beach/bay geomorphology and orientation (Hawes et al 2017; López et al 2019; Schreiber et al 2020). Similar to the floating stock, extensive strandings of floating kelps are partly driven by high seasonal supply from benthic source populations (López et al 2019). In addition, incidental weather events, such as strong storms, can deposit large amounts of buoyant seaweeds on shores (e.g., López et al 2019).…”

Section: Discussionmentioning

confidence: 99%

“…Seasonal and short time variations in wind fields and surface currents determine the trajectories of floating seaweeds and their stranding dynamics (López et al 2019; Schreiber et al 2020), thereby influencing their residence times at the sea surface (Pereyra et al 2013; Buonomo et al 2017; Hawes et al 2017). Strong onshore winds push floating seaweeds onto local shores (Harrold and Lisin 1989; Hawes et al 2017), whereas offshore winds can facilitate long‐distance dispersal when moving floating seaweeds away from the coast toward the open ocean (e.g., Hawes et al 2017).…”

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confidence: 99%

At the mercy of the winds: The seasonal dynamics of floating and stranded seaweeds at mid‐latitudes

Rothäusler

Hinojosa

Moraga

et al. 2021

Limnology & Oceanography

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Many seaweed species are particularly important for passive marine dispersal, yet relatively little is known about their floating and stranding dynamics. Here, we studied these dynamics for two kelp species over four consecutive years at mid‐latitudes (30°S). Floating kelps were found during all seasons, but Macrocystis pyrifera was always more abundant than Durvillaea incurvata. Highest floating biomasses were reached during summer and fall, whereas considerable stranded biomasses on nearby shores were only observed during summer. The proportion of fragments among the floating kelps was high throughout the entire study period and highest for M. pyrifera during summer. At the same time, blades of M. pyrifera that floated in nearshore waters in summer had a high blade index and thus were intact (i.e., not yet compromised by unfavorable environmental conditions). These results suggest that during summer, floating kelps become quickly resupplied from benthic sources, which compensates their frequent losses due to degradation and stranding. During fall, biomasses of floating kelps remain high because of reduced losses. Interestingly, increased wind speed was a good predictor for the biomass accumulations of the two kelp species, although the floating biomass of M. pyrifera was additionally influenced by oceanographic fronts. Our findings suggest that at mid‐latitudes the dynamics of floating seaweed stocks are dependent on the availability of benthic source populations (continuous throughout the year) and export due to degradation (high in summer/fall) and stranding (high in summer).

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“…However, high inter‐ and intra‐annual fluctuations of Durvillaea antarctica strandings have been recently described on beaches on the continental coast of Chile, with marked increases during austral summer and fall, and decreases during spring (López et al. ). Elsewhere, several possible factors influencing temporal availability of floating kelp have been described, such as seasonally varying floating persistence (Graiff et al.…”

Section: Discussionmentioning

confidence: 99%

“…For example, López et al. () revealed a positive relationship between stranded biomass of Durvillaea antarctica and local storm intensity on sandy beaches along the continental coast of Chile, suggesting that the amounts of beach‐cast rafts might be related to the benthic abundances of adjacent rocky shores.…”

mentioning

confidence: 99%

Connections Between Benthic Populations and Local Strandings of the Southern Bull Kelp Durvillaea Antarctica Along the Continental Coast of Chile¹

Schreiber

López

Rivadeneira

et al. 2019

Journal of Phycology

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Floating seaweeds are important dispersal vectors in marine ecosystems. However, the relationship between benthic populations and stranded seaweeds has received little attention. After detachment, a fraction of floating specimens returns to the shore, resulting in strandings that fluctuate in space and time. It has been hypothesized that the availability of stranded seaweeds is related to their benthic abundance on adjacent coasts. Using the large fucoid Durvillaea antarctica, we tested whether stranded biomasses are higher at sites with dense adjacent benthic populations. Benthic abundance of D. antarctica along the continental coast of Chile was estimated using three approximations: (i) availability of potentially suitable habitat (PSH), (ii) categorical visual abundance estimates in the field, and (iii) abundance measurements in the intertidal zone. Higher PSH for D. antarctica was observed between 31° S–32° S and 40° S–42° S than between 33° S and 39° S. Lowest benthic biomasses were estimated for the northern latitudes (31° S–32° S). Regression models showed that the association between stranded biomass and PSH was highest when only the extent of rocky shore 10 km to the south of each beach was included, suggesting relatively short‐distance dispersal and asymmetrical transport of floating kelps, which is further supported by low proportions of rafts with Lepas spp. (indicator of rafting). The results indicate that stranded biomasses are mostly subsidized by nearby benthic populations, which can partly explain the low genetic connectivity among populations in the study region. Future studies should also incorporate other local factors (e.g., winds, currents, wave‐exposure) that influence stranding dynamics.

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Spatio-temporal variability of strandings of the southern bull kelp Durvillaea antarctica (Fucales, Phaeophyceae) on beaches along the coast of Chile—linked to local storms

Cited by 18 publications

References 90 publications

Sea wrack delivery and accumulation on islands: factors that mediate marine nutrient permeability

Sea wrack delivery and accumulation on islands: factors that mediate marine nutrient permeability

At the mercy of the winds: The seasonal dynamics of floating and stranded seaweeds at mid‐latitudes

Connections Between Benthic Populations and Local Strandings of the Southern Bull Kelp Durvillaea Antarctica Along the Continental Coast of Chile¹

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Spatio-temporal variability of strandings of the southern bull kelp Durvillaea antarctica (Fucales, Phaeophyceae) on beaches along the coast of Chile—linked to local storms

Cited by 18 publications

References 90 publications

Sea wrack delivery and accumulation on islands: factors that mediate marine nutrient permeability

Sea wrack delivery and accumulation on islands: factors that mediate marine nutrient permeability

At the mercy of the winds: The seasonal dynamics of floating and stranded seaweeds at mid‐latitudes

Connections Between Benthic Populations and Local Strandings of the Southern Bull Kelp Durvillaea Antarctica Along the Continental Coast of Chile1

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Connections Between Benthic Populations and Local Strandings of the Southern Bull Kelp Durvillaea Antarctica Along the Continental Coast of Chile¹